Valve assembly



May 11, 1943- v A. LPARKER 2,318,963

VALVE ASSEMBLY Filed NOV. 28, 1940,

Patented May 11, 1943 UNITED STATES PATENT OFFICE a VALVE ASSEMBLY 4Arthur L. Pax-ker, Cleveland, Ohio lApplicatie November za, 1949, serial No. 361,656 s claims.. (ci. 251-146) This application is a continuation-in-part of my copending application Serial No. 350,762, led August 3, 1940.

The present invention relates to new and useful improvements in a valve assembly for controlling the passage of uid, and more particularly to improvements in a valve assembly in the form of a check valve foruse in hydraulic pressure lines.

In hydraulic pressure systems, it is often vdey sirable to include one or Vmore check valves inthe fluid pressure lines. Such a check valve operates l to'automatically open and close the pressure line in accordance with the pressure diiferential on opposite sides of the' valve. As the pressure varies, the valve is caused-to correspondingly move in opposite directions and the present inf vention ,contemplates the provision of a check seated position.

be-employed with relatively small tube or pipe An object of the present invention is to providet la valve assembly of the above type wherein chattering or pounding incident to opening and closvmore fu1ly`pointed out. d In the accompanying drawing:

portion which is movable in unison withopening and closing movements of the valve so that opposite movements of the valve arev positively and hydraulically nchecked or retarded.

'I'he above and other objects of the invention will in part be obvious and will be hereinafter Figure 1 isa longitudinal sectional .view valve assembly, showing the valve member in a' Figure 2 a longitudinal section, 'similar to Figure 1, bu showing the valve member lin an open position. f

Figure 3 is a longitudinal sectional viewof a modied form of valve assembly with the valve member in a seated position.

Referringv more in detail to the accompanying drawing, and particularly toAFigures 1 and 2, the

valve casing is illustrated as including male and wrench engaging portions Illa, IIa, respectively,

ing movements of the valve, is prevented by posif tive hydraulic checking or damping of movements of the valve in opposite directions.

. Another object of the invention is to provide a, valve assembly of the abovel type wherein the hydraulic checking of opposite movements of the valve is effected by providing cushioning chamber means arranged peripherally around the inner-surface of the valve casing so as not to interfere with through.

'AJurther object of the invention to provide the free passage of fluid therea' valve assembly of the above type wherein a A plurality'of cushioning chambers are employed and arranged so that one oi the chambers serves to hydraulically checko'pening movements ofthe valve while. another of the chambers serves to hydraulically check closing movements of the valve.4 g

A still further object of the invention is to provide'a valve assembly of the abovetype wherein each of the cushioning chambers includes a wall so that the parts can be tightly secured together. The male casing part is provided withan externally threaded extension I5 to which a'n outlet ordischarge conduit may be secured. The extension is centrally bored to provide a longitudinal discharge passage I6. 'I he female coupling part;v `I I is provided with an externally threaded exten" sion I1 which is centrally bored to provide a' longitudinal inlet passage I8. A suitable supply or inlet conduit is adapted to be secured to the threaded extension I1. l

Within the valve casing, the inner surface of the sleeve portion I2 on the female part II is outwardly oiset, as at I9, to provide an `annular shoulder 20. A valve member 2i has an inclined' fvalve member is also provided with'a cylindrical skirt portion 25 which cooperates with the reduced inner surface of the sleeve portion I2.A so as to guide the valve member in a rectilinear path. The valvev member is also provided with of the l, there is no communication between the` inletI passage Il and the ports 24 and the oiset skirt Nportion 2l is spaced from the shoulder or wall o portion V on the' sleeve l2 so as to provide a f chamber 21. 'Ihe male casing part i0 is provided with a'sleeve portion 29 of reduced thickness and extending beyond the threaded portion Il. The outer surface of the sleeve portion 28 overlaps and snugly nts the-inner surface of the offset skirt portion 29 on the valve member. A chamber 29 is thus provided between the threaded portion i4 and the end of the offset skirt portion 29 and it is to be noted that the end of the skirt portion 29 terminates short of the-end of the skirt `portion 25 so as to permit opening of the valve member. A coil spring is disposed within the chamber 29 and bears against. the

edge of the threaded portion i4 and the end of the skirt portion 26 and thus tends to normally `force the Vvalve member 2i toward a closed orv seated position. The skirt portion 28 is provided with a bleed hole Il therethrough so as to permit iluid in the system to gain access to the chamber 2l. Similarly, the 'skirt portion 25 on the valve member is provided with a bleed hole 32 which will be reduced in size. Thus, the iiuidwithin the chamber 21 will hydraulically check or retard closing movement of the valve and additional uidwill be drawn into the chamber 29 so as to r check any` further` opening movement of the valve.

From the foregoing description, it rwill be seen that both opening and closing movements of the valve member 2i are hydraulically checked, as distinguished from a checking by vacuum. Thus,

` pounding of the valve surface 22 on its seat 2l is prevented by the hydraulic dash-pot action of the chamber 21. Similarly, pounding'of the end of skirt, portion 25.against the end of the skirt portion 29 during opening of the valve member is prevented by the hydraulic dash-pot action of the chamber 29. The sleeve portion 26 on 4the valve member 2l serves asa movable dividing wall between the chamber.21,'29 so' that a positive hydraulic damping or' retarding of opposite movements of the valve member is obtained.

In some installations, it may be desired to provide a stronger retarding or dash-pot action to resist opening of the valve member than the closing thereof. In Figure 3-,of the accompanying' drawing, such an arrangement is shown. The skirt portion 29a on the' male coupling'part is spaced a greater distance inwardly away from the inner surface of the sleeve portion i2 on the female coupling part so as to provide a larger chamber 29a. With this construction, the sleeve portion 26a on the valve member 2l a is increased permits huid in the lsystem to gain access tothe chamber 21. Thus. both chambers 21,' 29 are maintained full of uid so as to provide a'. positive hydraulic blocking or checking action inthe manner to be Hereinafter pointed out, although provision may be made for the fluid to gain access to the chamber by seepage between the relatively moving parts.

The offset skirt portion 29 is movable with the valve member and thus provides a movable dividing wall between the chambers 21, 29. When f the valve member is seated in the position shown in Figure l, the chamber 21' has av relatively small uid content while the chamber 29 has a relatively large fluid content. When the pressure in the supply or inlet line reaches a degree suiiicient to overcome the force of the spring 39 inwardly in thickness so as to snugly iit around Vthe inner surface of the skirt portion 28a. Thus,

the chamber 29a is very much larger than the chamber 21 so that a greater hydraulic checking of the opening movement ofthe lvalve member 2 la is obtained. 0f course, in some installations, a stronger dash-pot actionmay be desired for the closing movement of the valve member in which case the relationship of the parts may be altered so that the chamber 21 will be larger than the chamber 29. This unbalanced hydraulic retarding action may 4also be obtained by alteringtherelative size of the bleeding holes 3|, 22.

' Thus,if the chambers 21. 29 had the same fluid intending to close the valve member, the valve surface 22 will be shifted away from the valve v seat 2l to substantially the position shown' in,

Figure 2 so as to permit fluid to pass from the inlet passage Il through the ports 24 and thence through the outlet passage I 6. During this opening movement of the valve member; the movable wall portion 29 will be similarly shifted so that -Y the size of the chamber 21 is increased while the size of the chamber 29 is decreased. Thus, this opening movement of the valve, member will be retarded or checked by the hydraulic resistance afforded by the u'id in the chamber 29 sixce' the fluid can only escape through the restricted bleed.

hole 3l. During this same opening movement of the valve member, the enlargement ofthe chamber 21 will draw in additional uid through the bleed hole 32 so as to maintain the chamber. 21

.wilh assist this movement. ADuring this closing Y movement of the valve member, the chamber 29 will be increased in size while the chamber2175.

content, the chamber 29 could be made to have lighter dash-pot 4action than the chamber 21 by making the bleed hole 3i larger in size than 4the bleed hole 32, and vice versa.. It is to be clearly understood that various changes in the details of construction and arrangement of parts may be made without departing from the scope'of the invention as set forth in the appended claims.

I claim: l

A1. A checkvalve assembly for use in fluid pressure lines, comprising a valve casing having inlet and outlet ports, a valve seat disposed within said valve, casing, a valve member adapted to cooperate with said valve seat for controlling the passage of iluid through the valve casing, means providing-apair of annular chambers around the inner surface of said valve casing and including a dividing wall .between the chambers, said dividing wall being movable with said valve memberv whereby each `chamber varies in'size according to movements of the valve member;

means'providing restricted communication between each chamber and the pressure line for effecting hydraulic checking of opposite movements of the valve member whereby to prevent chattering or pounding of the valve member during opening and closing movements thereof. and said chambers being of 'diie'rent radial sizes whereby to eiect differential checking of `opposite movements of the valve member.

2. A check valve assembly for use in uid pressure lines, comprising a valve casing having inlet and outlet ports and a sleeve portion extending within and spaced inwardly of the casing, a valve seat disposed within said casing, a valve member adapted to cooperate with said valve seat for controlling the .passage of fluid through the valve casing and having a skirt portion fitting within the valve casing with a portion thereof disposed between said sleeve portion and the inner surface of the valve casing whereby to provide a pair of annular chambers with a movable dividing wall therebetween, said sleeve portion and said skirt portion having restricted openings therethrough for providing restricted communication between the pressure line and the chambers whereby to eiect hydraulic checking of opposite movements of the valve member.

3. A check valve assembly comprising a casing having unobstructed passage therethrough and having at the opposite ends thereof projecting portions for pipe connections, each projecting portion having a port leading therethrough to the interior of the casing, said casing including inner and outer sleeves, one within the other, having a threaded connection, said portion carrying the outer sleeve having a valve seat at the inner end of the port through the projecting portion thereon, a valve located in said casing, said -valve having a cylindrical skirt making sliding contact with the inner wall of the outer sleeve, said inner sleeve having an integral extension spaced from the outer sleeve and extending into the cylindrical skirt to make sliding contact with the inner wall thereof, a spring disposed within the chamber formed between the inner and outer sleeves and bearing against the skirt of the valve for normally holding said valve closed said sleeve extension having an opening therethrough disposed and dimensioned so as to permit restricted communication between said chamber and the central fluid passage in said casing, said valve having openings therethrough disposed outside ofthe line of contact between the valve and the valve seat.

4. A check valve assembly comprising a casing having an unobstructed passage therethrough and having at the opposite ends thereof projecting portions for pipe connections, each projecting portion having a port leading therethrough to the interior of the casing, said casing including inner and outer sleeves, one within the other,

having a threaded connection, said portion carry-v ing the outer sleeve having a valve seat at the inner end of the port through the projecting portion thereon, a valve located in said casing, said valve having a cylindrical skirt making Vsliding contact with the inner wall of the outer sleeve, said inner sleeve having an integral extension spaced from the outer sleeve and extending into the cylindrical skirt to make sliding contact with the inner wall thereof, a spring disposed within the chamber formed between the inner and outer sleeves and bearing against the skirt of the valve for normally holding said valve closed, said valve having openings therethrough disposed outside of the line of contact between the valve and the valve seat, and means movable with said valve member and disposed within said valve casing for hydraulically checking movements of the valve member in opposite directions whereby to prevent chattering of the valve during the opening and closing movements thereof.

5. A check valve assembly comprising a casing having at the opposite ends thereof projecting portions for pipe connections, each projectingA portion having a port leading therethrough to the interior of the casing, said casing including inner and outer sleeves, one within the other, having a threaded connection, said portion carrying the outer sleeve having a valve seat at the inner end -of the port through the projecting portion thereon, a valve located in said casing. said outer sleeve having an outwardly offset portion in the inner wall thereof, said valve having a cylindrical skirt making sliding contact with the inner wall of the outer sleeve, said skirt having an oiset portion making contact with the inner wall of the offset portion in the inner wall of said outer sleeve, said inner sleeve having an extension spaced from the outer sleeve and extending into the cylindrical skirt to make sliding contact with the inner wall thereof. a spring disposed within the chamber formed between the inner and outer sleeves and bearing against the skirt of the valve for normally holding the valve closed, said skirt having an opening therethrough leading into the chamber between the valve and the outer sleeve and said inner sleeve having an opening therethrough leading into the chamber containing said spring, said valve having openings therethrough disposed outside of the line of contact between the valve and the valve seat.

ARTHUR L. PARKER. 

